The question arises in the context of a recently written script that rectifies photographs by means of IM's -distort perspective. Besides other information, the user has to provide the image coordinates of four match points, which they have to determine in advance and have to note on an piece of paper.
So far, I know of (and have used) the following approaches:
- Get the current rectangular selection from IrfanView's title bar.
- Get real coordinates 0 .. 1 from a Winmorph file.
- Generate point lists with Fiji (ImageJ)
Any other ideas over here?
Could I possibly ask the user to mark the pixels with a certain colour and then get the coordinates of these pixels with IM?